John j



June 10 1924. 1,496,795

J. J. VAN HAMERSVELD INDEXING MECHANISM FOR MACHINE TOOLS Filed May 1'7, 1922 "T Sheets-Sheet 1 N M mmW lune 10 1924.

J. J. N. VAN HAMERSVELD INDEXING MECHANISM FOR MACHINE TOOLS Filed May 17 1922 '7 Sheets-Sheet 2 ALL; 9

June 10 1924.

1,496,795 J. J. N. VAN HAMERSVELD INDEXING MECHANISM FOR MACHINE TOOLS Fild May 17, 1922 7 Sheets-Sheep s June 10 1924.

1,496,795 J. J. N. VAN HAMERSVELD mnsxmc MECHANISM FOR MACHINE TOOLS ts--Sheet Filed May 17 1922 InL-v e 1111025 Julie 10 1924;

J. J. N. VAN HAMERSVELD INDEX I NG MECHANISM FOR MACHINE TOOL Filed May 17. 19222 7 Sheets-Shet s June 10, 1924. 1,496,795

J. J. N. VAN HAMERSVELD INDBXING MECHANISM FOR MACHINE TOOLS Filed May 17 1922 7 Sheets-Sheet 6 2 $6 I i I IIiz.u em 1% June 10 1924.

J. J. N. VAN HAMERSVELD INDEXING MECHANISM FOR mamas TOOLS 7 Sheets-Sheet 7 diti'erent work spindles] tatented June It) 1924.

UNITED STATES PATENT OFFICE.

I JOHN .1. N. VAN HAMERSVELD, or CLEVELAND, 01110, nssrsnon 170 THE WARNER m) SWASEY COMPANY, or CLEVELAND, one, A coarorwrxon or omo,

INDEXING MECHANISM FDR MACHINE TOOLS.

Application filed May 17,

To all whom it may concern:

Be it known that I, JOHN J. N. VAN HAMERSYELD, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Indexing Mechanism for Machine Tools, of which the following is a full, clear, and exact description.

This invention relates to an indexing mechanism for machine tools, and particu' larly for automatic multiple spindle-chuckin machines In fact, the indexing mechanisms disclosed in this application constitute parts of automatic iriultple spindle chucking machines forming the subject matteu of three prior applications of which the present application is a composite division. said rior applications being Serial No. 424,139,

led November 15, 1920; Serial No. 437,436, filed January '15, 1921; and Serial No. 534, 887, filed February 8, 1922.

In said prior applications I have disclosed automatic multiple spindle chucking= machines having a series of work stations and a'loading station, and provided with a rotary spindle carrier carrying a number of work spindles and having also at the different work stations, tool heads,

particularlytool slidesadapted to be pro vidcd with cutting tools to simultaneously perform a series of cutting operations on the work pieces held in the chucks of the In said machines provision is made for simnltaneously rotating the work spindles, also for imparting at different times relatively fast and relatively slow movements to the tool heads. i

Additionally each machinc is provided with an indexing mechanism, the primary function of which is to impart step by step indexing movci'ncnts t0 the spindle carrier. Additionally the indexing meclianism in each instance performs other functions more or less closely allied to the indexing function, andtliese include the release or unlocking of the spindle carrier just prior to the indexing movement, the restoration to normal position of the part which timed 1922. Serial No. 561,692.

or brou ht about the action of the indexing mec anism, and finally the lockin of the spindle, carrier against rotation folIowing the completion of the indexing move ment. t a

In the machines shown in the first and second applications above referred to, the work spindles'are arranged vertically on the horizontally. disposed spindle carrier and extending u from the base centrally through the machine there is a vertical column on which are mountedfor vertical movements the severa'l tool slides, the second machine differing from the first largely in the fact that the feed units for the tool slides are arranged in the base of the machine rather than in the head permitting a somwhat more compact and shorter machine to be produced with the same floor space.

In the third application referred to, a still shorter and more compact machine is obtained by providing the horizontally rotatable spindle carrier with horizontally and radially arranged rotary work spindles, and by arranging the tool slides outside of v 1 o n the spindle carrier and providing n and out horizontal movement therefor.

In the machines of all three applications the timing of the indexing of the spindle carrier is brought about by the dow nw ar movement of a vertically movable controller which is automatically released when all the work stations have completed their individual cutting operation and the tool heads have reached their former posit ons. When p i y,

the controller moves downward by or by gravity assisted by a spring necessary, it releases the spindle'carrier by imclamping it from the circular way constituting' a part of the frame of the machine aiid causes the engagement of a clutch which starts the operation of the index'ingunit. \Vhen the indexing unit is started it first withdraws a lock bolt which is designed to enga e in one of several taper bushings carried y the spindle carrier so as to lock it against rotation and definitely position it with respect to the tool heads of the different work stations, after each index ng movement. Next. the indexing unit causes the d se spindle ,carrier to be turned through a fraction of a revolution depending upon the number of work stations, following which the s indle carrier is again locked in position y the lock bolt and clamped to the circular way.

During the indexing movement of the spindle carrier the indexing unit performs a further function of elevatin the controller to its normal position, the. e evating of this member servin to engage the clutch which controls the spindle drives and to start the feed units of the different work stations in operation.

When t he controller is raised, the feed units of the diflerent work stations start their individual cycles,'but before the indexing unit has completed all its functions, a Geneva motion gear forming a art thereof is caused to continue its rotation until it has made one complete rotation, the indexing unit having means for preventing the,

disengagement of the clutch controlling the indexing unit until the Geneva motion gear has completed its rotation as 'ust stated.

The principal object of t e present invention isto provide an eflicient indexing mechanism, and particularly an indexing unit especially adapted, but. not necessarily confined in so far as all features of the invention are concerned, to automatic multiple spindle chucking machines such as illustrated in my prior applications above rcferred to.

Further the invention aims to provide an indexing unit which is constructed and arranged not only to cause the spindle carrier to be indexed, but also to perform the additional functions referred to above.

A further object is to provide an indexing mechanism or unit which acts as a safety device to prevent the premature 'functioning of other partssuch as the lowering of the controller prior to the completion of all movements and functions of the indexing mechanism andprevents the disengagement of its driving clutch to guarantee a complete rotation of its Geneva motion member. In order words, it is one of the objects of the invention to provide as a part of the indexing mechanism, means for iu suring the maintenance of the various parts of the machine in their proper timed relationship, and the prevention of the operation of one part out of the regular sequence and before the proper completion of the function of some other part.

The invention may be briefly summarized as consisting in certain novel details of construction, and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the accompanying sheets of drawings wherein I have shown three embodiments of m invention, Fig. 1 is a vertical sec tiona view of the lower part of an automatic multiple spindle chucking machine shown in my application, Serial No. 424,135; this view illustrating particularly the indexing unit and some of the other parts of the machine; Fig- 2 isa transverse sectional view substantially along the line 2-9. of Fig. 1, lookin in the direction indicated by the arrows; ig. 3 is a detail sectional view substantial] along the. line 33 of Fig. 2, looking in the direri tion indicated by the arrows; Fig. 4 is a detail sectional v" w substantially alonghthe line 4-4 of l*1g. 2; Fig. 5 is a-view similar to Fig. '1, showing aqportioITof the machine of my application aerial No. 437,436. and illustrating a slight modification of the indexing mechanism; Fig. 6 is a transverse sectional .i iew substantially along the line 6-6 of Fig. 5; Fig. 7 is a detail sectional View substantially along the line 77 of Fig. 6; Fig. 8 is a view similar to Figs'l and 5, showing a portion of the machine illustrated in my application Serial No. 534,887, and showing a further slight modification of the indexing mechanism; Fig. 9 is a sectional view substantially along the line 9-9 of Fig.,10; Fig. 10 is a transverse sectional view substantiallyalong the line 10-10 of Fig. 8; and Fig. 11 is a detaii sectional view substantial y along the line 1l11 of Fig. 9, looking upward or in the direction indicated by the arrows.

.Referring now to the drawings and first to Figs. 1. 2, '3 and 4, 15 represents the base of the automatic multiple spindle chucking machine, from which base rises a central column lfiha'ving an extension 17 on which'theseveral tool slides, not shown, are adapted to be mounted. A frame'18. which rests upon and is secured to the base 15, has a circular way 19 constituting a support for the rotary spindle carrier 20 havng-a pluralitwof vertically disposed rotary work: spindles 21 provided at their upper ends with chucks 22 for holding the work pieces, this spindlecarrier being centered on the column 16 by a 'taper ring 23. held in place by a circular nut-24 which is threaded onto a portion of the column 16.

As the present invention residesparticularly in the indexing mechanism it is unnecessary to illustrate the entire machine fully shown and described in my applica tion Serial 'N'o.- 424,139, and only those parts which directly co-operate with the indexing mechanism are shown. It will be sufficient to state, therefore, that power is derived from the main drive shaft for the purpose nio of rotating the work spindles through the medium of a series of vertical shafts- 25, one

of which is provided for each work station,

trains, each including a pinion 26 at the bottom of the lower end of the associated shaft 25, an idler gear 27 which is supported on the center column and a gear 28 which is secured to the lower end of one of the work spindles. When tne spindle carrier is indexcd the several gears 28 move therewith out of engagement with the idler gears 27, and at the completion of the indexing movement these gears 28 roll into mesh with the said idler gears 27. Likewise, it may be stated that the indexing unit is operatedby a constant speed shaft 29 which is continn ously rotated by the main drive shaft, and by a shaft 30 designed to be clutched to the. shaft 29 by a clutch indicated at 3].. this clutch being engaged when the indexing unit is to be operated, and beiug'disengaged when the Geneva motion gear of the indexing unit has substantially completed one to tation.

Extending centrally through the column 16 is a controller which in this instance is in the form of a slidable rod 32, the function of this controller so far as the indexing mechanism. and therefore the present invention is concerned, being to start the indexing unit in operation. This controller 1&2 is provided with a collar 33 which causes the engagement of the clutch Ell when the controller lowers, motion being transmitted from the collar to the clutch by a clutch leverlll. For the purpose of elevat ing the controller there is provided inside the colunm and sub )orted thereby, a belltlilllh'. 35 which is operated by the indexing mechanism in the manner hereinafter dcsrribed, and has an arm extending inwardly toward the controller beneath a lower collar 36 arranged so that when the inwardly extending arm of the bell-crank 3? is elevated. this arm by engaging under the collar 36 will restore the controller to its normal upper position where it is automatirally locked and prevented from lowering as fully described in my application'scrial No. 424,139.

To lock the spindle carrier in position after (lllt'll indexing movement the frame 18 is provided with a vertically movable lock bolt 37 having an upper tapered and adapted to engage into one of several bushings 38 carried by the spindle carrier. The lock bolt has a rod 37" extending downwardly toward the base of the machine and at this lower end it is provided with a collar 39 adapted to he engaged by the outer end of a lever 40 pivotally supported on the frame l and having ati-its inner end a roller 4H.

For the purpose of rotating the spindle carrier the latter is provided with an internal gear 4'! which is engaged by a gear 42 on a vertical shaft 43 supported by the central column and base, and provided near its lower end with i a gear 43 which is driven by an indexing gear to be referred to.

Taking up now the indexing mechanism per se it will be observed that the shaft 30 is provided at its lower end with a pinion 30" which engages and is adapted to drive at Geneva motion gear 44, this gear being provided in this instance on its lower face with a rolller 45 adapted to engage in one of a series of radial slots of an indexing gear 46, the radial slots being shown in Fig. 2 and designated 46. This indexing gear as shown in Fig. 1 engages and drives the gear 48, mounted on the vertical shaft 43 which imparts rotary motion to the indexing carrier, the ratio between the hidcxing gear 46 and the gear 43 being the same as the ratio between the internal gear 41 and the gear 42, so that the indexing gear 46 will move the internal gear 41 and therefore the spindle carrier through the same are that the indexing gear is moved by the (leneva motion gear.

By reference particularly to Fig 2 it will be observed that there provided on the. upper face of the Geneva motion gear M an are shaped cam H which is arranged near the periphery of the gear, this ram being fidapted to engage the roller it) of the lever 40 so as to rock said lever and disengage the lock bolt. 3? from the bushing of the spindle carrier. Inside of the circular or are shaped cam 44 the Geneva motion gear is provided with a similar but long are shaped cam 44-". The function oi this are shaped cam is to prevent the clutch 3L being disengaged when the controlicr 32 is elevated, and that this might be done, I provide inside the vertical central column [6 an endwise movable rod 47 provided at its upper end with a roller 47 which on gages in a groove of the shil'tahlc clutch element of clllltltlfl. At its lower end this rod 47 (see Figs. 2, 3 and l) provided with a lug #17 and this lug is engaged by the aFc shaped cam it and rid s on the top of this cam so as to prevent the lowering of the rod 47 and the disen 'agenn-i'd o'i the clutch 31 after the controller 32 hasv been elevated, and until the lllltYil motion gear 14 has substantially completed one rotation, at which time the rod 47 is lowered so as to disengage the clutch by a beveled ram portion designated 44"". provided at the end of .the are shaped cam 44".

.Mlditionally the Geneva motion gear 44 is provided inside the are shaped cam 44 with a face cam 44., this face can! being adapted to be engaged by a roller 35 at the bottom of a downwardly extending arm of the bell- -ranl 35 which is instrumental in raising the controller 32. 'lbis face cam 44. cugages the roller 35 during the indexing movement of the carrier, and is designed to complete the elevating movement of the conlows: lVhen the controller 32 is lowered the collar 33*swings the lever 3t and causes the engagement of clutch 31 connecting shaft to the constant speed shaft 29. This immediately starts the rotation of the Geneva motion gear 44. As soon as the Geneva motion gear 44 startsits rotation, cam 4-1 engages the roller on the inner end of the lever 40 and rocks the lever 40, disengaging the lock bolt 37 "from the spindle carrier bushing 38 against the pressure of a spring 37", which spring surrounds the lock bolt rod 37 extending downwardly from the lock-bolt. The length of this cam is such that it rides out of engagement with the roller 40 sons to release the lever 40 and lock bolt and permit the latter to be restored by the spring 37 to locking position at the. completion of the indexing movement of the spindle carrier.

As soon as the lock bolt 37 disengagcs the spindle carrier, the roller on the lower face of the Geneva motion gear enters one of the slots 46 of the indexing gear 46 and turns the indexing gcar through the fraction of a revolution to rotate the spindle carrierthrough a similar are. During the indexing movement of the carrier the face can] 44 comes into play by engaging the roller 35 on bell crank 35. and swings said bell crank 35 so as to gradually elevate the controller, the controller being lil'ted and then automatically locked in elevated position at substantially the completion of the indexing movement of the spindle carrier. Just before the controller 32 starts its elevating movement under the action of the face cam 44, the circular or arc shaped cam 44 rides nndcr a lag 47" on rod 47" adjust ably secured to the lower end of rod 47 and prevents the lowering of the movable clutch membe of the clutch 31. and thuspreveuts the disengagement of said clutch when the controller is elevated and the collar 33 is lifted out of engage ncnt with the lever 34. The rod 47" is slid-ably mounted and splincd in the bearing 16 as part of the frame to, and said rod has a threaded engagement with rod 47 in order to allow adjustment.

It will he observed that the cam it" of considcrable arcuate length, the length being such that it will prevent the disengagement of the clutch 31 until the Geneva mo dravflh the spindle carrier was indexed during which the controller was elevated and the look bolt then restored to locking position, during which time the Geneva motion gear has rotated through a portion of its rotativo movement, the clutch is not. disengaged, and. in fact, is held by the cam 44" from being disengaged until the Geneva motion gear has substantially completed its rotation, so that it may he in position to properly function for the new or next succeeding cycle.

It is essential that the (icucva motion gear malze precisely one complete rotation in order that all parts may he maintained in proper timed relationship, and therefore to carry the portion 44" of ram {4* out of the path of lug 47" and to move the Geneva motion gear through the small remaining por-\ tion of the are necessary to complete its rotation following the disengagement of clutch 31, I provide a spring point 48, shown by full lines in Fig. 1 and by dotted lines in Fig. 2, this spring point being supported by the base 15 in position such that when the movement of the Geneva motion gear is about to he stopped by the disengagement of the clutch 31, this spring point acts upon a swing point block 44" on the lower face of t In (icncva motion ar and thus moves or continues to rotate t e Geneva mot-ion gear just far enough to complete its rotation.

Thus the indexing mechanism performs the several functions stated. and is maintained in operation until the Geneva motion gear is in just the proper position to again function for the next succeeding cycle of operations.

In Figs. 5,,6 and? I have shown amodified form of my invention as illustrated in my prior application Serial No. 437,436. Inasmuch as the construction of the two machines shown in Figs. 1 to 4 and in Figs. 5, 6 and '7, in so far as the parts illustrated are concerned, are very nearly the same. and as the material changes are in the indexing mechanism alone, I will confine the description to the parts directly involving the invention and will apply without detail description the reference characters which were utilized in describing the similar or corresponding parts in the construction first described.

Referring then to the indexing mechanism, it will be seen that I employ at Geneva motion gear 49 which is similar to the Geneva motion gear 44-, and that this gear haspn its lower face a roller 49* which rotates an indoviug gear 50 having radial slots 50 which the roller is adapted to enter, this gear 50 bring geared to the internal gear 41 of the spindle carrier 20 as in the first instance, this spindle carrier having the vertically disposed work s )indles 2t operated in like manner to that escribed through the medium of the shaft 25 and gears 26, 27 and 28, the latter being carried by the work spindles.

this case as in the preceding casegthe uenevzi nlotion gear 4 9 is provided on its upper face with several car's. These ii'iclude a cam 49 for lowcridg: 11 lock bolt 37. this Cain as in the print inst :ince being arranged adjacent the periphery of the Geneva motion gear and being adapted to he engaged by the roller 40 atLthc inner end of the lever 40. lnside the cam -19" there are two are shaped cams 49" and 49. The innermost can: 49'' cu'responds to the cam 44 of Fig. 2, the tin ction of this cam being to prevent the clutt l 31 from lacing disengaged after the con. ollcr 32 is lifted. and cing de signed t ville under it Lug t? at the lower end of the rod 4% secured to the lower end of rod 47 which in this instance is pinned at 4? to thc lcver 34 which operates the clutch 31. This cam 49" as in the prior instance has at its end a portion 49". the purpose of which is to positively move the rod 47 downw rd and thus disengage the clutch when the Geneva motion gear 49 has substantially completed one rotation. The clutch 31. in this machine is located in the uppermost portion of the machine 17 shove the slide sup orting part 17 of the center column 16, as will be seen by reference to my prior aplication. Flerial No. 437.436. As is brought out in said application. the shaft 30 is designed to be rotated through clutch 31 constant speed Worm wheel 31" having clutch teeth out on its lower-face'and being rotatably mounted on stationary shaft 31*.

The cum corresponding to the face cam 44 of Fig. 2 and which functions to ele rate the controller rod 32 is the middle are shaped cam 49 of Fig. 6. lnthis instance the controller 32 has n hrackct 51 mounted on its lower end, having an arm 51" carry ing a roller 51 and said arm is slidulily mounted in a slot 16 (see Fig. 6) of a supporting bracket 16"- ns part of the center milumn. The bracket 51 carrying the roller Til" so positioned that the cam 49 will elevate it and thus lift the controller rod 32 while the indexing movement is be ing imparted to the spindle carrier 20. This are shaped cam 49 has a tapered or pointed portion 49" which elevates the controller 32 somewhat above its normal position. for a purpose fully explained in my prior application. Serial No. 437,436. and then contiuues around the Geneva motion gear at it somewhat; less elevation so as to serve as a means to positively prevent; the controller being lowered until the Geneva. motion gear has fully completed its rotation. In this respect the mechanism illustrated in Figs. 5, (i and 7 has on additional function which the indexing mechanism first. described does not posses. That is to so); the use of the arc shaped com 151 lllt lifitltl of the lace cam 44 of Fig. 2 not. only enables me to employ this cam -19 to restore the controller 32 to its normal upper osition. but serves to preven the lowering o the controller IOd until the tloncvn motion gear has been restored to a position such that it is ready for the next cycle of operations of the machine. in other words. with this mechanism it is inipossihlc for the parts to get out; of the prhpcr timed relation with respect; to one another.

In this instance as in the preceding construction. I provide aspring point for the purpose of con ualetin g the rotation of the (lPllClll motion gear after the clutch 31 has been disengaged. In this instance the spring point is designated 52 and is mount ed nhove the Geneva motion gear 49, being held in a bracket 53 \vhic is bolted to the center column of the machine. The lower bevel end of this spring point 52 is adapted to engage with the elevated beveled portion -l9of the circular are. shaped cam 49 to move or. continue the rotation of the Geneva motion gear 49 after the clutch 31 has been disengaged just for enough to eztactly complete is rotation. At the same time it moves the portion 49" of the circular or are shaped cam 49" out of the path of lug t? on rod 47*? and per- 7 nuts the clutch to he engaged at the start; of the next cycle of operations of the machine. "Thus it will be seen that with this construction as with the prior construction the indexing; mechanism withdraws the lock bolt; from locking: engagement with the spindle carrier. then indexes the spindle carrier. and then causes the lock liolt to lic restored, ole-- rates the controller during: the index ng: movement, prevents the clutch cont rolling the indexing mechanism from being disenginglctl when the controller is elevated. or until just prior to the completion of the rotation of the Generu' motion gear. nnd additionally prevents the lowering of the controller during the rtmminin; portion of the rotation of the Geneva motion gear.

The indexing mechanism of Figs. 8. 9, 10 and ll constituting a port. of the automatic multiple spindle chucking machine illustrated in application crinl no. 534.887. performs identical Functions to those already des ribed. lllll th lntltxlllfl unit is arranged in :1 machine constructcd somewhat ditl'crcntlythuu those already described. In this instance th work spindles and chucks at: thciroutcr ends and designated by the reference character 54 are arranged horizontally and radially near the top of the nmchine in the spindle carrier here designated 5'5 and rotatable on a circular way 56. adapted as in the prior instances to he locked lay the lock bolt 37. The circular way 56 is providcd near thetop of the Frame 57 which at. its lower endrcsts upon and is bolted to It, base 58. The frame has a circular column 59 which extends down to the base as shown.

In this instance the machine has a central vertical drive shaft 60 and surrounding this shaft there is a vertically movable controller in the form of a sleeve 61 which is connected by links 62 to a clutch lever 63 which operates a clutch 64 which as described fully in my application Serial No. 534,887 controls the spindle drives. When the controller sleeve is elevated, it is held in elevated position b a series of controller lock pins, one of which I have illustrated at 65 in Fi 8, these lock ins being portions of the fee units and ein adapted to enter beneath a number of bloc s 66 secured to the controller sleeve.

In this machine the vertical drive shaft 60 is provided at its lower end with a pinion 67 which through a series of idler gears 68 rotates an internal gear 69 having a bevel gear 70 which is engaged b a series of bevel gears 71 forming parts 0 the several feed ,.clude an outer a c shaped cam 84 w x.- enga ed b units for the tool slides, and also a similar bevel gear 72 which rotates at a constant speed a horizontally disposed shaft 73 which is connected by worm 74 and a worm wheel 75 to a sleeve 76 designed to be clutched by an indexing clutch 77 to a vertical shaft- 78 having at its upper end a pinion 7,9. This clutch 77 corresponds to'the clutch 31 of the prior constructions inasmuch as it clutches the shaft instrumental in operating the indexing mechanism to a constant speed shaft, the shaft 78 and the pinion 79 being preferably formed in one integral part, the present construction eliminating the necessit for a long shaft such as the shaft 30 of the prior constructions. V

The indexing clutch 77 is operated when the controller sleeve 61 is lowered, a lug 61 thereon swings downward a lever arm 80 to which is connected a second lever arm 81 which through a horizontally extending pin 82 actuates a bell-crank clutch lever 83 of the indexing clutch 77. This engages the clutch and causes the rotation of a pinion 79 which meshes with 2. Geneva motion car 84 having a roller 85 on its upger ace which in the manner previously escribed rotates an indexing gear 86. Rotating with the indexing car 86 is a ear 86 which drives a gear 8 on a. vertica shaft 87", this shaft having at its upper end a gear which enga es the internal gear 88 securd to the spin is carrier, the mechanism for transmittin motion from the indexing gear to the spind 0 carrier being the same in principle and function as the similar mechanisms already described.

In this instance the Geneva motion car 84 has on its lower face cams correspon ing to those alreadydescribd. Thefi s inii :0 ler 89 on a bracket 89 i cu to t e lower fpart: of the lock bolt rod 87, the function 0 this cam 84? being as in ing" ing instances,

the prior instance to disenga e the lock bolt from the spindle carrier am? to release the lock bolt so that it may be restored to looking position by the sprin at the end of the indexing movement of tlie spindle carrier.

Inside the cam 84" longer are sha ed cam 84 which engages a e inner end of the lever 86 previous! described, whose opposite end engages un er the block 61" of the controller s eeve 61. This cam has an elevated tapered f'portion 8 4" and when this portion of the cam engages the roller 80 it elevates the controller to a point sli htly above its nornial upper position for t iepurpose fully expained in my pu'or ap lication Serial No. 534,887, the controller 1; en being automatically locked in its normal position by a ries of lock bolts 65 already referred to. eyond the elevated part 84" the cam continues at a uniform elevation, and all the time that this portion of the cam is engaged with the roller 80 the controller is vented from being cam therefore per orming the same function {irelowered, this part of the a there is a similar but as the corresponding part of cam 49 of r controller sleeve is elevated. This cam 84 moves in the arm 83 whic is integral with the bell- Bath of the upper end of an crank clutch lever 83, this taking place just as the cntroller sleeve is about to be ele vated. By reference to Fig. 8 it will be observed that when this lever 83 is engaged by the cam 84 the clutch is prevented from bein disengaged until the end of the cam is reac ed, and thus the clutch 77 is held enga d until the Geneva motion gear has an stantially com leted its rotationl Inside the arc sliaped cam 84 I provide a face cam 84 which is so positioned that when the Geneva motion gear has substantiallycompleted its rotation itenga s the upstanding lever 83 and shifts sai ,lever outward and thus positively disengages the clutch 77, this face cam being clearly shown in Fi 11.

Ad itionally I provide as in the preceda spring point 90 for the pur pose of moving or causing the Geneva motion ear to continue to rotate until it has exact made one complete rotation. This spring point which is shown in Figs. 8 and 10 gives the Geneva motion gear 84 the slight additional movement just explained by engaging with the elevated portion 84;" of the arcsha ed cam 84", and after having moved. the its rotation it engages in a groove 84 in the cam 84* to hold the Geneva motion gear against accidental movement caused by tibration or the like.

Thus as in the preceding cases, when the controller 61 is lowered, it causes the indexing clutch to be engaged, and immediately the indexing unit is started in operation. Immediately after the Geneva motion gear thus starts to rotate, the cam 84 disengages the lock bolt. from the spindle carrier; then the roller 85 enters one of the radial slots 86" of the indexing gear 86 and the spindle carrier is indexed through the mechanism described, following which the cam 84" will release the lock bolt to reengage the spindie carrier as soon as it comes to rest. \Vhile the. indexing movement is being given to the spindle carrier, the cam 84 elevates the coin troller and as already stated, prevents the controller being lowered prior to the comletion of the functions of the-indexing unit. Bust. before the controller is elevated, the cam 84 comes into action and prevents the indexing clutch 77 from being disengaged until the Geneva motion gear has substantially completed its rotation. Then the face cam 84 positively disengages the clutch T7, whereupon the" spring oint 90 comes into action and moves the ileneva motion gear through the further short distance necessary to complete its rotation and to move the face cam 84 out of the path of the lever 8. the spring point then acting as explained to hold the Geneva motion gear against movement. although it will not prevent the Geneva motion gear being rotated by the pinion 79 when the clutch 7,7 is next ongaged. t

in thc tori-going description l have cx plaincd tlircc slightly different embodiments of thc invention. but other changes may be inndc. and I do not desire to bc confined to the precise details or arrangements shown.

l lllllllll'llltll't, while the. indexing units shown and dcscribcd were designed and are particulm's'y adapted for use in automatic multiplc spindle chucking machines disclosed in my prior application rclci'it'cl'to, my invcntion may be uscd advantageously in othcr types of machine tools, and in the appended claims the expression machine tools is used in the broad sense as inclusive of other tools than the automatic multiple spindle chucking machines.

Having described my invention. 1 claim:

in a machine, tool having-a rotatable unit to be indcxcd, one or more. tool slides and :1 controller movable in opposite dircctions izulc u-mlcntlv oi' the tool slide or slidcs. rm indexing mechanism. and means whereby the luttcr is caused to function by the movcmcnt of said controller in one (iirection.

In a machine tool having a rotatable unit to be, indexed, one or more too] slides and a slideble controller movable independcntlv of the tool slide or slides, an indexing mechanism, and means whereby the latter is caused to function h Y the movem nt of sa d controller in one direction 3. In a machine toolhavmg a rotatable unit.

to be indexed, one or more tool slides and a.

controller movable in opposite directions independently of the tool slide or slides, an indexing mechanism, a clutch controlling the indexing mechanism. and means whereby the controller by its! 'emcnt in one direction cau es the engagement of the clutch.

4. In a machine tool having a rotatable unit to be indexed, one or more tool slides and a slidablc controller movable independentlv of the tool slide or slides. an indexing mec ninism, av clutch controlling the indexing mechanism, and means whereby the controller by its movement in one direction causes theengagement of the clutch.

In a machine tool having a controller and a rotatable unit adapted to be indexed, an indexing mechanism, a clutch controlling the indexin mechanism. and means whereby the controller causes the engagement of the clutch, said indexing mechanism having means for preventing the disengagement of the clutch until after predetermined functions have been performed by the indexing mechanism. 7

6. In :1 machine tool having: a slidable controller and a rotatable unit adapted to be indexed. an indexing mechnnism. a clutch controlling the indexing nu-chanism, and means whereby the controller causes the engagement of the clutch. said indexing mechanism having means for preventing the dis engagement of the clutch until :1 tier predetcrmincd functions have been performed by the indexing mechanism.

7. In a machine tool lmvinc a controller and a rot atablc unit adapted .to be indexed, an indexing unit. means whereby the latter is caused to function by the movement of the controller in one direction, said indexinc unit having means for causing the controller to be moved in the reverse direction.

8. In a nmchinc tool having a slidable controller and a rotatable unit, adapted to be indexed, an indexing; unit. means whereby the latter is caused to function by the movement of the controller in one dircction, and means whereby the indexing unit causes the controller to be moved in the reverse direc- -tion. I

9. In a machine tool having a controller and a rotatable unit adapted to be indexed, a lock bolt for preventing rotation of said unit, an indexin; mcchanism. means whereby said indexing mechanism is caused to function by movement of the controller. said indexing mechanism hiivinfilfncdns for dis use engaging the lock bolt and rotating the V rotatable unit.

10. In a machine tool having' a controller and a. rotatable unit adapted to be indexed,

a lock bolt for prcventing rotation of said unit, an indexing mechanism, means where by said indexing mechanism is caused to function by movement of the controller.said indexing mechanism having means for rotating the rotatable unit, and having a circular rain for disengaging the lock bolt.

11. In a machine tool having a controilcr and a rotatable unit adapted to be indexed, a lock bolt for preventing rotation of said unit, an indexing mechanism, means whereby the indexing 'hibchanism is caused to function bvniovement oi the controller, said indexin mechanism having means comprising a (:eneva motion gear for rotating the rotatable unit, and a cam on said gear for controlling the lock bolt.

12. In a machine tool having a rotatable unit adapted to be indexed, an indexing unit. a clutch by which the latter is connect ed to a power shaft of the machine, a controller for causing the engagement of said clutch, said indexing unit having means for preventing the disengagement of the clutch until predetermined functions have been performed thereby.

13. In a machine tool having a rotatable unit adapted to be indexed; an indexing unit, a clutch by which the latter is connected to a power shaft of the machine, a controller for causing the cngagcment of said clutch. said indexing unit having a cam for preventing the disengagement of the clutch until predetermined functions have been performed thereby.

H. In a machine tool having a rotatable and adapted to be indexed, an indexing unit, a clutch by which the latter is connected to a powcr shalt of the machine. a controller for causing the cugagcmcnt of said clutch, said unit having a (icncva motion gear and a cam on said gear for preventing the dis engagement ofthe clutch until predeterminedTunrtiofis havc been performed thereby.,,

15. In a machine tool having a. controller and a rotatable unit adaptcd to be indexed, an indexing unit, mca'iis whereby the latter is caused to function by the movement of the controller in one direction, said indexing unit having means for moving the controller in the opposite direction and for preventing movcmcnt of thc cont roller in the first named direction lrotil the indexing mechanism has completed all its functions.

In. In a machine tool having a rotatable unit adapted to be indexed. an indexing mechanism for rotating said unit, a clutch for controlling the operation of said indexing mechanism, said indexing mechanism comprising a rotatable member having means for controlling the disengagement of the clutch, and means for causing said member to move a Suliioient amount after the disengagement of the clutch so as to cause it to make one complctc rotation each time the indexing mechanism is caused to function.

17. In aniachine tool having a rotatable unit adaptcd to hc indexed, an indexing mechanism for rotating said unit, a clutch for controlling the operation of said indexing mechanism, said indexing mechanism comprising a rotatable member, and a spring point co-operating with said rotatable member for insuring one complctc rotation thereof each time the indexing mechanism is caused to function.

1 In a machine tool having a rotatable unit to be indexed, an indexing mechanism for indexing Said unit. a clutch adapted to be engaged to cause the operation of the indexing mechanism, a lock bolt:- i'or engaging the rotatable unit to prevent rotation thereof, said indexing mechanism comprising a rotatable member having cams for controlling the look bolt and for controlling the clutch.

19. In a machine tool having a rotatable unit to be indexed, an inderin mechanism for indexing said unit, a clutch adapted to be engaged to cause the operaton of the indexing mechanism. a lock bolt for engaging the rotatable unit to preventrotation thereof, said indexing mechanisn comprising :1 Geneva motion gear having cams for controlling the lock bolt and for controlling the clutch.

20. In a machine tool, a rotat. ble unit adapted to be indexed, an ind xing mechanism therefor, a lock bolt for mgaging said rotatable unit to prevent rotation thereof, a clutch adapted to be engaged to cause'the operation of the indexing mechanism, a. controller for controlling the engagement of the clutch, said indexing mechanism comprising rotatable means having cams tor controlling the lockholt, for controllin the disengagemerit of the clutch and for s lifting the controller to normal position.

21. In a machine tool having a rotatable nnit adapted to be indcxed. an indexing mechanism for rotating said unit, a, lock bolt adapted to engage said unit to prevent rotation thereof, a clutch adapted to be engaged to cause the operation of the indexing mechanism, a controller movable in one direction to cause the cngagcmcnt of said clutch, said indexing mechanism comprising a Geneva motion gcarhaving cams for controlling the lock bolt, for controlling the disengagement of said clutch and for re storing the controller to normal position, I 22. In a machine tool having a rotatable unit adapted to be indexed, indexin mechanism for rotating said unit, a loci? bolt adapted to engage said unit toprevent rotation thereof, a clutch ado ted tohe engaged to cause the operation 0 the indexing rection to cause the engagement of said new motion gear to insure one complete clutch, said indexing mec enism com rising rotation .thereof 7 each time the indexing a Geneva motion gear having cams or conmechnnism is caused to function. I.

trolling the lock bolt, for controlling the In testimony whereof, I hereunto aflix my 6 disen agement of said clutch and for restorsignature,

ing t e controller to normal position, and means cooperating with a part of said Go- JOHN J. N. VAN HAMERSVELD. 

